TaskFactory.FromAsync<TResult> Method (Func<AsyncCallback, Object, IAsyncResult>, Func<IAsyncResult, TResult>, Object, TaskCreationOptions)
Microsoft Silverlight will reach end of support after October 2021. Learn more.
Creates a Task<TResult> that represents a pair of begin and end methods that conform to the Asynchronous Programming Model pattern.
Namespace: System.Threading.Tasks
Assembly: mscorlib (in mscorlib.dll)
Syntax
'Declaration
Public Function FromAsync(Of TResult) ( _
beginMethod As Func(Of AsyncCallback, Object, IAsyncResult), _
endMethod As Func(Of IAsyncResult, TResult), _
state As Object, _
creationOptions As TaskCreationOptions _
) As Task(Of TResult)
public Task<TResult> FromAsync<TResult>(
Func<AsyncCallback, Object, IAsyncResult> beginMethod,
Func<IAsyncResult, TResult> endMethod,
Object state,
TaskCreationOptions creationOptions
)
Type Parameters
- TResult
The type of the result available through the Task<TResult>.
Parameters
- beginMethod
Type: System.Func<AsyncCallback, Object, IAsyncResult>
The delegate that begins the asynchronous operation.
- endMethod
Type: System.Func<IAsyncResult, TResult>
The delegate that ends the asynchronous operation.
- state
Type: System.Object
An object containing data to be used by the beginMethod delegate.
- creationOptions
Type: System.Threading.Tasks.TaskCreationOptions
The TaskCreationOptions value that controls the behavior of the created Task<TResult>.
Return Value
Type: System.Threading.Tasks.Task<TResult>
The created Task<TResult> that represents the asynchronous operation.
Exceptions
| Exception | Condition |
|---|---|
| ArgumentNullException | The exception that is thrown when the beginMethod argument is null. -or- The exception that is thrown when the endMethod argument is null. |
| ArgumentOutOfRangeException | The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value. The exception that is thrown when the creationOptions argument specifies an invalid TaskCreationOptions value. For more information, see the Remarks for FromAsync |
Remarks
This method throws any exceptions thrown by the beginMethod.
Version Information
Silverlight
Supported in: 5
Platforms
For a list of the operating systems and browsers that are supported by Silverlight, see Supported Operating Systems and Browsers.
See Also